Crushing-machine.



G. H. FRASER.

CRUSHING MACHINE.

APPLICATION FILED mac. a1, 1907. RENEWED JUNE I2. we.

Patented Mar. 20, 1917.

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WITNESSES: W

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G. H. FRASER.

CBUSHING MACHINE. APPLICATION FILED DEC. 31' 1907- RENEWED JUNE 12. I916.

1 ,220, 1- 57. Patented Mar. 20, 1917.

3 SHEETS-SHEET 2.

WITNESSES: 3a m G. H. FRASER.

CRUSHING MACHINE. APPLICATION FILED DEC-31, 1901. RENEWED JUNE I2. 1916.

INVE NTOR 1 B zitorneys Patented Mar. 20, 1917.

3 SHEETS-SHEET 3 WITNESSES:

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CRUSHING-MACHINE.

Specification of Letters Patent.

' Patented Mar. 20, 1917.

Application filed December 31, 1907, Serial No. 408,773. Renewed June 12, 1916. Serial No. 103,341.

To all whom it may concern:

Be it known that I, GEORGE HoL'r Fnasnn, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Crushing-h lachines, of which the following is a specification.

This invention relates to machines for crushing, grinding or pulveriZing hard ma terials, and particularly to such machines having a revolving ring inclosing usually three crushing rolls, in which type of machine the material is crushed between the inner face of the ring and the outer faces of the rolls, which press outwardly against the ring. Springs are usually employed to press the rolls outwardly,rand the rolls are usually mounted on transverse, shafts, to one of which driving power is employed for rotating the ring and the remaining rolls by traction. The roll shafts are carried in bearings which are connected around the exterior of the ring and are movable in directions radially of the ring.

The invention aims to provide certain improvements especially applicable to mills of this general type.

The preferred form of the invention is shown in the accompanying drawings, in which,

Figure 1 is a side elevation partly in section on the planes of the line 11 in Fig. 2;

Fig. 2 is a front elevation partly in section on the line 2-2 in Fig. 1; r

Fig. 3 is a rear elevation partly in vertical mid-section on the line 33 in Fig. 1 and looking in the direction of the arrow;

Fig- 4: is a face view of the dust guard;

Fig. 5 is a fragmentary-section showing the dust guard 1n section on the line 55 in Fig. 4;

Figs. 6, 7 and 8 are enlarged views of the feed chute.

The crushing ring is lettered a, the crush ing rolls 1) 7), their shafts 0 c, theirpressure springs (Z (Z, and the adjusting screws therefor e e. A is the casing, B is the side cover, C are bearing frames, and D their caps. E is the drive pulley, F is the feedsp out, and G is the hopper.

The casing A incloses the ring and rolls. Three rolls are shown, one at the top yieldingly supporting the ring, and the other two equally disposed within the ring. The inner face of the ring is concave and fits the outer erably placed on the top shaft 0 for driving the top roll, which then drives the ring, which in turn drives the lower rolls. Preferably allthe rolls are 'movable radially of the ring, and the ring is movable radially of the rolls, so that the parts are free to yield to vibration or to adapt themselves to i the work between their crushing faces. Thus the ring is a revolving annular die which re ceives on its inner face the rock to be crushed, and the rolls are revolving crushing 1 rolls which crush the rock against the inner face of the ring.

The bearing frames C are preferably rigid U-shaped frames which pass around the outer side of the ring, preferably exterior tothe casing, to connect the opposite hearings to hold them rigidly in line, while permitting the roll and shaft to move radially of the ring, and also'laterally or axially. Each of the lower bearing frames is preferably formed with an integral arm Z which is hung to the casing at f, preferably above the rolls, so that the frame can swing inwardly and outwardly with the radial movement of the rolls.

Each of the bearing frames is preferably formed with a hinged cap D connected to it by a single bolt 9 at each side of the bearing, these bolts being preferably parallel with the shafts, so that when the bolts traverse the ears h on the frames and ion the caps, there is no possibility of 'thecaps being displaced relatively to the frames in direction radially of the shafts when the parts are assembled, as would be the case if the bolts were disposed at right angles to the shafts,

although they may be so placed if desired.

Each frame G is provided with a thrust member, preferably a roller j, which strikes against a fixed part on the casing to limit axial movement of the frame. This roller is preferably arranged to permit the frame to have a slight axial movement under end thrusts of the shaft.

Each frame is made with a thrustface 70 definitely located relative to the thrust member j, and has a bearing socket Z which is preferably bored cylindrically, but may be bored as a segment of a sphere.

In this socket is a bearing member H, which has a spherical or partially spherical external portion fitting the socket Z, so that the bearing member can oscillate therein after the manner of a universal joint to adapt itself to the shaft. The member H may be a tubular casting, but I prefer to form it in halves. It may be of bearing metal and constitute itself the anti-friction bushing for the shaft, but I prefer to form it with a cylindrical bore m and to insert two removable semi-cylindrical sleeves or bushings of Babbitt metal 1 Within it for carrying the shaft. The upper half 0 of the member H is formed with an oil well 27 and the lower half Q is formed with a shoulder r, and both halves when bored are finished on a line with this shoulder, which engages the end of the frame 0, and limits the inward position of the member H. The outer face of this member is formed with a thrust face a for the thrust collar t of the shaft.

A dust guard I surrounds the shaft at the inner end of each bearing, and has a tubular projection J, preferably round or formed as a segment of a sphere on its outer side, which fits into the bore of the member H and is supported thereby, so that the dust guard can slide axially of the member, and may cant in its support as the frame rocks. A spring K fits within the dust guard and reacts against the bearing member, serving to keep the dust guard pressed against the side of the casing to close the shaft slot thereof. The dust guard has enlarged or oval apertures L through it for passing over the shaft with sufficient clearance to permit travel of the latter as it wears into the bushings, and has an outer wall M adjacent to the bearing, and a chamber N between its two walls. In this chamber are two sliding plates .3 kept apart by a spring or bar 1;. The plates 8 have bores fitting the shaft and are free to float with the movements of the shaft relatively to the dust guard. They are pressed against the opposite faces of the guard and close, the clearance openings therethrough from the casing on one side and the bearing on the other side. They are so thin and slight that they are practically passive members adapting themselves to the shaft, and do not exert sutlicient pressure thereon to groove the shaft. The spring or bar 25 holds them spaced apart, and the space within this spring constitutes a stufling boX into which waste or packing may be rammed through the side apertures u.

The dust guard slides against the side of the casing with the movements of the hearing frames, and its plates 3 slide within it with the wear of the shaft into the babbitt.

Projections 'b on the dust guard, by engaging the adjacent frame, prevent the dust guard from rotating as best seen in Figs. 3 and 4.

The casing is preferably divided horizon tally through its middle into upper and lower sections as shown in Fig. l, and formed with an integral side wall to and an integral spout 00 cast on it on one side, and with an enlarged opening 2 on its opposite side, which opening is closed by the cover B.

Shaft slots (4 shown in Fig. 1, are formed in the casing and cover, and both these parts are formed with a large central opening ('lOSGd by a removable cover 0, which has notches and flanges corresponding with the shaft slots, and constitutes a removable part of the wall around these slots, so that any shaft may be removed by removing this cover, without otherwise opening the machine.

The inner wall of the casing and the op posite cover are machined to receive Wear pieces P which prevent the ring from coming in contact with the casin An improved feed chute Q having a sepa rate nose R is provided within the spout as for guiding the feed onto the ring. The nose R interlocks with the spout and is constructed as shown, so that it can be removed through the adjacent hand hole if renewal is necessary, or if removal of the chute through the spout is desired.

The feed hopper G has a. flanged receiving end I), a contracted neck 0 in which is a gate (Z, a cylindrical throat 6 below this gate, an adjustable throttling ring 7" surrounding this throat and regulated by a lever g, a revolving feed table It below this 7 throat, an integral gear chamber supporting this table, and an outlet j fitting over the spout. The feed table h has a plurality of concentric racks m on its under face, an outer bearing portion engaging the edge of the gear chamber to prevent ingress of dust thereto, and a central bearing 0 supporting its weight and holding it concentric of the hopper. the gear chamber on a. driving shaft q in such manner that it can be adjusted along the shaft to engage one or other of the racks according to the speed of rotation desired for the feed table. The hopper has a central bearing 1" for supporting the table, the twobeing kept in relation by a pin a or other means. The shaft 1 is driven by a stepped or grooved pulley t and belt u from the grooved pulley o of the mill. A front door '10 affords access to the hopper, a lever 00 operates the gate, and a gravity lock y holds this lever.

In operation, the feed to the hopperis permitted when the gate is opened. It is directed onto the revolving table by the cuton f, which is adjusted to regulate the A driving pinion p is mounted in.

amount of feed on the table. The speed of the table is determined by whichever rack shaft. The dust guards slide in the bearing members during motion of the latter. The weight of the suspended lower bearing frames is so nearly balanced that the springs determine the crushing pressure irrespective of the weight of the yokes.

It will be seen that my invention provides improvements which can be readily and advantageously availed of, and it will be understood that the invention is not limited to the particular details of construction, arrangement and combination of parts set forth as constituting its preferred form, since it can be employed in whole or in part according to such modifications as circumstances or the judgment of those skilled in the art may dictate, without departing from the spirit of the invention.

For the purpose of more completely disclosing the scope andapplicability of the features incident to this invention which I prefer to claim in this application many features of improvement in crushing and grinding machinery and in bearings and in other devices especially applicable thereto, are herein shown and set forth, but not specifically claimed in this application, being the subject matter of claims in my application Serial No. H6220, filed February 2, 1917, which is a division of this application.

I claim as my invention 1. In combination, an annular crushing die revolving in an approximately vertical plane and having an internal crushing face, a movable and rotatable crushing roll Witl1- in, eccentric to, and disposed below the uppermost part of said die and having a crushing face reciprocal to that of the latter, means for revolving one of said parts, nonrotative swinging means on which said roll is rotatably mounted having a rigid portion pivotally suspended on and swinging directly from a fixed axis above and ap proximately parallel with the axis of said roll, and means pressing said roll outwardly toward the inner face of said die to resist a crushing pressure therefrom.

2. In combination, an annular crushing die revolving in an approximately vertical plane and having an internal crushing face, a plurality of rotatable crushing rolls within and eccentric to said die and each having an external crushing face reciprocal to the internal crushing face thereof, one of said rolls movable toward and from another thereof, means for revolving one of said parts, nonrotative swinging means on which said movable roll is rotatably mounted having a rigid portion extending upwardly and pivotally suspended on and swinging directly from a fixed axis above and substantially parallel with the axis of said roll, and means pressing one of said rolls away from another thereof to resist a crushing pressure from the inner face of said die.

3. In combination, an annular crushing die revolving in an approximately vertical .plane and having an internal crushing face,

two or more rotatable crushing rolls movable toward and from each other within and eccentric to said die and each having an external crushing face reciprocal to the internal crushing face thereof, means for'revolving one of said parts, a non-rotative swinging member on which one of said rollsis rotatably mounted having a rigid portion suspended on and swinging directly from a fixed axis above the axis of its roll, a nonrotative swinging member on which another of said rolls is rotatably mounted having a rigid portion extending upwardly and sus pended on and swingingdirectly' from a fixed axis above the axis of its roll, and means holding said rolls outwardly away from one another to resist a crushing pressure from the inner face of said die.

'fi:. In combination a revolvin annular crushing die having an internal crushing face, two or more rotatable crushing rolls movable toward and from each other within and eccentric to said die and each having an external crushing-face reciprocal to the internal crushing face thereof, means for revolving one of said parts, nonrotative swinging means on which one of said rolls is rotatably mounted, non-rotative swinging means on which another of said rolls is rotatably mounted, said swinging means each having a rigid portion pivotally mounted on and swinging directly from a common axis,

and means pressing said rolls outwardly to resist a crushing pressure from the inner face of said die.

5. In combination, an annular crushing die revolving in an approximately vertical plane and having an internal crushing face, three rotatable crushing rolls within and ec centric to said die, each having an external crushing face reciprocal to the internal crushing face thereof, one of said rolls disposed near the upper part of said die and the others disposed below said roll andmovable toward and from each other, means for revolving one of said parts, non-rotative means on which said uppermost roll is rotatably mounted, non-rotative swinging means on which one of said lower rolls is rotatably mounted having a rigid portion suspended on and swinging directly from a fixed axis above the axis of its roll, non-rotative swinging means on which the other of said lower roll is rotatably mounted having a rigid portion suspended on and swinging directly from a fixed axis above the axis of its roll, and means holding said lower rolls outwardly away from one another to resist a crushing pressure from the inner face of said die.

(3. in combination, an annular crushing die revolving in an approximately vertical plane and having an internal crushing face, three rotatable crushing rolls within and eccentric to said die movable toward and from each other and each having an external crushing face reciprocal to the internal crushing face thereof, one of said rolls disposed near the upper part of said die and the others disposed below said roll, means for revolving one of said parts, upper non-rotative swinging means on which said uppermost roll is rotatably mounted having a rigid portion pivotally mounted on and swinging directly from a fixed axis at one side of its roll, non-rotative swinging means on which one of said lower rolls is rotatably mounted having a rigid portion pivotally suspended on and swinging directly from the pivotal axis of said upper non-rotative means, non-rotative swinging means on which the other ofisaid lower rolls is rotatahly mounted having a rigid portion pivotally suspended on and swinging directly from a fixed axis at the other side of said upper roll, and means holding said rolls away from one another to resist a crushing pressure from the inner face of said die.

7. In combination, an annular revolving crushing die having an internal crushing face, a movable and rotatable crushing roll within and eccentric to said die and having Copies of this patent may be obtained for five cents each, by addressing the a crushing face reciprocal to that of the lat ter, means for revolving one of said parts, a casing for said parts and having a chamber receiving said parts and having a slot opposite said roll and a central aperture large enough to pass said roll, communicating with said slot, a cover closing said aperture and having a notch coinciding with said slot, a non-rotative movable member carrying said roll, and mounted at a point out- \vardly of said casing, means traversing said slot for connecting said roll and member, and means pressing said roll outwardly to resist a crushing pressure from the inner face of said die.

8. .ln combination, an annular revolving crushing die, having an internal crushing face, two or more movable and rotatable crushing rolls within and eccentric to said die and each having a crushing face reciprocal to that of the latter, means for revolving one of said parts, means for supporting said die, swinging members carrying said rolls respectively, one of said members pivotally 5 suspended on and'swinging directly from a fixed axis disposed above its roll and substantially parallel with the axis of said die and each having a portion extending across and on both sides of a plane intersecting the center of its roll, and means pressing said rolls away from one another to resist a crushing pressure fromthe inner face of said die.

In witness whereof, I have hereunto 5 signed my name in the presence of two subscribing witnesses.

GEORGE HOLT FRASER.

Witnesses 2 FRED XVI-UTE, THOMAS F. VVALLACE.

Commissioner of Patents,

Washington, D. G. 

